package com.hardy.Thread;

import java.util.Random;
import java.util.concurrent.*;

/**
 * Author: fuxh3@lenovo.com
 * Date: Created in 2018/2/26 0026
 */
public class CallableAndFuture {
    public static void main(String[] args) {
        ExecutorService threadPool = Executors.newSingleThreadExecutor();
        Future<String> future = threadPool.submit(new Callable<String>() {
            @Override public String call() throws Exception {
                return null;
            }
        });
        System.out.println("wait result");
        try {
            System.out.println("get result: "+future.get());
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
        ExecutorService threadPool2 = Executors.newFixedThreadPool(10);
        CompletionService<Integer> completionService = new ExecutorCompletionService<Integer>(threadPool2);
        for (int i=1;i<=10;i++){
            final int seq = i;
            completionService.submit(new Callable<Integer>() {
                @Override public Integer call() throws Exception {
                    Thread.sleep(new Random().nextInt(5000));
                    return seq;
                }
            });
        }
        for(int i=0;i<10;i++){
            try {
                System.out.println(completionService.take().get());
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }

        }
    }
}
